Rotary pump



June 9, 1925. 1,541,435

E. L. RELLER ROTARY PUMP Filed Jan. 24, 1924 5 al 7 mm,

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Patented June 9, 1925.

' UNITED STATES PATENT OFFICE.

EDWIN L. KELLER, OF ST. LOUIS, MTSSOURI, ASSIGNOR T0 WISSLER INSTRUMENT COM- PANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF DELAWARE aorARY PUMP.

Application filed J'anuar y 24, 1924. Serial No. 688,293.

To all whom it. may concern:

Be it known that I, EDWIN L. RELLER, a citizen of the United States, and residing at St. Louis, State of Missouri, have invented the new and useful Improvement in Rotary Pumps, of which the following is a specification.

This invention relates to pumps and more articularly to rotary pumps, such as are l iiequently used for pumping oil and the In the use of these pumps, particularly when the fluid pumped is oil, considerable difficulty is experienced in making the pump casing tight'against leakage. The ordinary design of such a pump is such that no particular difficulty is met with making oil tight joints, with the exception of that point where the rotary driving shaft enters the casing. At this oint a moving element must enter the casln at a point where the pressure of the flllld'lS active and it is very diflicult to prevent leakage of the fluid out of the casing through the shaft bearing.

An object of this invention, therefore,is to provide means for effectively sealing the I casing against leakage, particularly along the driving shaft.

Further objects will appear from the detail description taken in connection with the accompanying drawing, in which:

Figure 1 is a longitudinal sectional view of a rotary pump embodying this invention;

Figure 2 is a section on line 22, Figure 1;

Figure 3 is a plan view of Figure 1 with the cover removed;

Fi re 4 is a detail in perspective showing t e connection between the shaft and the rotating element; and

Figure 5 is'a detail of the shaft retainer.

Referring to the accompanying drawing, 1 designates the casing which is usually of cast metal, such as brass, cast iron, aluminum or other suitable material. The casing is provided with an inlet 2 and an outlet 3. The inlet and outlet communicate with a chamber 4 adapted to house rotating elements 5 and 6. The rotating elements fit the chamber 4 closely at their sides and also at the periphery of said elements in such a manner as to prevent leakage to the fluid therearound. The element 5 may be mounted on a suitable stub-shaft 7 having a bearing in the casing 1. The elements 5 The rotatable element 6 is flexibly con- Y nected with the drive shaft 8 as illustrated in Figure 4. The element 6 is provided with a socket 11 ada ted to fit somewhat loosely over the end 0 the shaft 8'. Within the socket 11 is a pair of pins 12 ri 'dly fixed in the element 7. The end 0 shaft 8 is provided with a transverse slot 13 adapted to receive the ins 12,when the end of the shaft is entere into the socket 11. The ins 12 thereby provide a key connection with the shaft 8. The ins,.h0w-

ever, fit somewhat loosely in the s 0t '13 and the fit of the shaft 8 in the socket 11 is sufliciently loose so as to allow the element the 6 to adjust itself angularly u on the shaft.

The fit is, however, sufficient y snug to accurately aline the element 6 radially. The casing 1 may be provided with an extended bearing 1-1 for the shaft 8 adapted to support the shaft.

The cover 9 may be rovided at a point opposite the shaft 8 wit a boss 15 adapted to accommodate a socket 16 on the interior thereof. The socket 16 is adapted to receive a spring 17 adapted to force a ball 18 or other suitable bearing element against the rotatable element 6 so as to mamtain the same yieldingly seated against the shaft end of the casing.

Since the element 6 is connected to the shaft in such a way as to permit angular alinement of said element, the pressure of the spring 17 will keep the element 6 alwa s in firm contact with the inner end of t e casing 1. It has been found that this con- .struction overcomes practically all difliculties experienced with leakage of the fluid along the shaft bearing. Since in former constructions the rotating element has been rigidly connected to the shaft, angular variation thereof with respect to the shaft has been impossible. Gonsequently since it is practically impossible to construct the apparatus in such a wa that the rotating element will be exactfy perpendicular to the shaft or that the inner face of the casing will be exactly perpendicular to the axis of the bearing, more or less gap has always been present between the rotating element and the casing. For this reason it has been impessible to prevent leakage of the fluid through this gap and thence through the shaft bearing to the outside of the casing. By the present construction this gap is em tirely eliminated so that it is practically impossible for the fluid to leak between'the rotating element and the casing to the bearing.

The shaft 8 may be formed with a shoulder 19 adapted to be engaged by a retainer 20 in the form ofa plug mounted on a spring-clip 21 and inserted through a hole 22 in the shaft bearing. When the plug 20 is so inserted the spring-clip 21 encircles the bearing 14 and rests in a suitable groove 23 provided therefor. The shaft is thus removab-ly retained in its hearing. In order to remove the same, it is only necessary to disengage the clip 21 and remove the plug 20, after which the shaft may be slipped down- Wardly, Figure 1, out of the bearing 14.

It will be clear from the foregoing description that this invention accomplishes its objects. Means are provided for maintaining an effective seal between the rotatable pumping element and the casing Wall so as to prevent the fluid from leaking past said element and to the shaft bearing. This is accomplished by providing a flexible connection between the shaft and said element in order to permit the latter to adjust itself angularly with respect to the shaft, so as to maintain its seat against the casing wall. A yielding pressure is provided to maintain the element against its seat. The driving connection is at the same time such as to maintain the rotatable element radially in alinement.

It is obvious that various changes may be made in details of construction without departing from the spirit of this invention; it is, therefore, to be understood that this in- VGIIJtlOIl is not to be limited to the specific details shown and described.

Having thus described the invention, what is claimed is:

1,. A rotary pump comprising, a casing, an element rotatable in said casing, a shaft having a loose driving connection with said element, and means for holding said element against the shaft end of said casing.

2. A rotary pump comprising, a casing, an element rotatable in said casing, a shaft, means for holding said element against the shaft end of said casing, and a driving connection between said shaft and said element adapted to permit free seating of said element.

3. A rotary pump comprising, a casing, an element rotatable in said casing, a shaft having a loose driving connection with said element, means for holding said shaft, and means for seating said element against the shaft end of said casing.

4. A rotary pump comprising, a casing, a shaft having a bearing in said casing, a rotatable element adapted to seat against the shaft bearing and having a loose driving connection with said shaft, and means for holding said element against its seat.

5. A rotary pump comprising, a casing,

a shaft, a rotatable element adapted to seat against the shaft end of said casin and having a loose driving connection wisaid shaft, and means for yieldingly holding said element against its seat.

In testimony whereof I afiix my signature this 21st day of Dec, 1923.

EDWIN L. RELLER. 

